The most probable reason that the alkaline earth metals give dipositive ions instead of unipositive ion is
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a
The compounds with +2 oxidation state have more lattice enthalpy than those with +1 oxidation state
b
The values of their first and second ionisation potentials are not very much different
c
The dipositive ion has grater charge than the unipositive ion.
d
The compounds of +l oxidation state of these metals are not stable
answer is A.
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Detailed Solution
The most probable reason that the alkaline earth metals give dipositive ions instead of unipositive ion is. The compounds with +2 oxidation state have more lattice enthalpy than those with +1 oxidation state.